Officer Daniel Alvarado, 45, is on paid administrative leave while SAPD investigates the shooting. A 16-year veteran of the force, Alvarado was assigned to the patrol division and was in full uniform in a patrol car Friday afternoon, school district spokesman Pascual Gonzalez said.

Gonzalez and San Antonio police said Alvarado was patrolling an area near Pease Middle School on Friday when he came across a fight at a bus stop at Hunt Lane and Santa Fe Ridge.

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Witnesses told police Derek struck another boy in the face with the back of his hand. Alvarado tried to detain the teen, who ran across the street and into the Trails of Santa Fe neighborhood, the report states.

Alvarado took a witness to the fight along with him as he tried to find Derek in the residential area, police said.

Neighbors then told Alvarado that Derek was hiding in a backyard in the 200 block of Roswell Canyon, where someone inside that home had already called 911 to report a possible burglary in progress.

Alvarado searched the yard but couldn't find the boy, police said.

He reportedly announced, "Police, police," several times before peering into a shed where Derek was hiding. According to police, Derek was crouching on the ground and then lunged through the shed's door, knocking it in Alvarado's face.

Alvarado, "fearing for his life," discharged one round, striking Derek in the chest, the incident report states. He then conducted cardiopulmonary resuscitation until EMS arrived, police said.